Slack time:
"The amount of time by which the expected finish date precedes the due date "

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Definitions of terms related to Slack time:

• Changeover time
• Cumulative lead time
• Cycle time
• ead time
• Move time
• Planned queue time
• process time
• purchasing lead time
• Queue time
• real time
• Run time
• Safety time
• Setup time
• Standard time
• wait time